I finally ascertained that the woofer 123a-1 and positive transducer
and the 2213h and a negative transducer.
I having foolishly replaced the 2213h with the 123a-1 in my 4312 first series (with original crossower
)What should I do ? reverse the wires behind the 123a-1?
to have a right crossover ?

thanks for the help luigi